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Heat and Mass Transfer

Heat and Mass Transfer
The unit of overall coefficient of heat transfer is

kcal/m²
kcal/hr °C
kcal/m² hr °C
kcal/m hr °C

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Heat and Mass Transfer
Two balls of same material and finish have their diameters in the ratio of 2: 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of

0.042361111111111
0.084027777777778
0.043055555555556
0.16736111111111

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Heat and Mass Transfer
The insulation ability of an insulator with the presence of moisture would

Remain unaffected
Decrease
May increase/decrease depending on temperature and thickness of insulation
Increase

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Heat and Mass Transfer
The ratio of Nusselt number and the product of Reynold's number and Prandtl number is equal to

Peclet number
Stanton number
Grashoff number
Biot number

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Heat and Mass Transfer
Sensible heat is the heat required to

Increase the temperature of a liquid of vapour
Convert water into steam and superheat it
Change vapour into liquid
Change liquid into vapour

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Heat and Mass Transfer
Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly have radiation heat exchange between them. It is desired to reduce 75% of the radiant heat transfer by inserting thin parallel shields of emissivity 1 on both sides. The number of shields should be

One
Two
Three
Four

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